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Single-cell RNA Sequencing and Analysis of Human Pancreatic Islets
Published on: July 18, 2019
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Reference-based analysis of lung single-cell sequencing reveals a transitional profibrotic macrophage.
Dvir Aran1, Agnieszka P Looney2, Leqian Liu3
1Bakar Computational Health Sciences Institute, University of California, San Francisco, San Francisco, CA, USA.
Nature Immunology
|January 16, 2019
Summary
Researchers identified a specific subgroup of transitional macrophages that drive tissue fibrosis. These disease-associated macrophages, crucial in lung fibrosis, are potential therapeutic targets for fibrotic diseases.
Area of Science:
- Immunology
- Cell Biology
- Pulmonary Medicine
Background:
- Tissue fibrosis, a significant cause of mortality, involves matrix protein deposition by activated mesenchymal cells.
- Macrophages infiltrate fibrotic tissues, yet the specific roles of macrophage subgroups in fibrogenesis remain unclear.
- Understanding macrophage heterogeneity is crucial for elucidating fibrosis mechanisms.
Purpose of the Study:
- To characterize macrophage heterogeneity in bleomycin-induced lung fibrosis using single-cell RNA sequencing (scRNA-seq).
- To identify specific macrophage subgroups that contribute to the fibrotic process in vivo.
- To explore the translational relevance of identified macrophage populations in human fibrotic lung disease.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) was employed to analyze macrophage populations in mouse models of lung fibrosis.
- A computational framework (SingleR) was utilized for annotating scRNA-seq data by referencing bulk transcriptomes.
- Macrophage subclusters were identified, focusing on disease-associated transitional populations.
Main Results:
- scRNA-seq revealed a distinct subgroup of CX3CR1+SiglecF+ transitional macrophages within the fibrotic lung niche.
- These transitional macrophages exhibit an intermediate gene expression profile between monocyte-derived and alveolar macrophages.
- Functional analysis indicated a profibrotic role for these transitional macrophages in vivo.
- Human orthologs of genes expressed by these macrophages were found upregulated in idiopathic pulmonary fibrosis patient samples.
Conclusions:
- A novel pathological subgroup of transitional macrophages has been identified as critical drivers of the fibrotic response.
- These transitional macrophages are essential for the fibrotic response to injury in the lung.
- The findings highlight transitional macrophages as a potential therapeutic target for treating tissue fibrosis, including idiopathic pulmonary fibrosis.
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